Health

they are not regulated by the FDA - they don't go through controlled clinical trials. The actual dose of active ingredient - or purity - can't be confirmed under the current regulations.

Think of the store GNC - and the like - the supplement area of Whole Foods, etc - very expensive items with no confirmation of what is actually in the bottles.

Of course it is individual choice, but there is a huge placebo effect with this sort of thing that makes assessment of results pretty much impossible to quantify.